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                <h1 id="📧-异步、定时、邮件任务"><a href="#📧-异步、定时、邮件任务" class="headerlink" title="📧 异步、定时、邮件任务"></a>📧 异步、定时、邮件任务</h1><hr>
<blockquote>
<p>在我们的工作中，常常会用到异步处理任务，比如我们在网站上发送邮件，后台会去发送邮件，此时前台会造成响应不动，直到邮件发送完毕，响应才会成功，所以我们一般会采用多线程的方式去处理这些任务。还有一些定时任务，比如需要在每天凌晨的时候，分析一次前一天的日志信息。还有就是邮件的发送，微信的前身也是邮件服务呢？这些东西都是怎么实现的呢？其实 SpringBoot 都给我们提供了对应的支持，我们上手使用十分的简单，只需要开启一些注解支持，配置一些配置文件即可！那我们来看看吧~  </p>
</blockquote>
<h2 id="1-异步任务"><a href="#1-异步任务" class="headerlink" title="1. 异步任务"></a>1. 异步任务</h2><p>新建一个带有 Web 模块的 Spring Boot 项目，创建一个  <code>service.AsyncService</code> 类，编写方法，假装正在处理数据，使用线程设置一些延时，模拟同步等待的情况：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Service</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AsyncService</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
            <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"业务进行中..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>创建 <code>controller.AsyncController</code> 类：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@RestController</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AsyncController</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Autowired</span>
    <span class="token class-name">AsyncService</span> asyncService<span class="token punctuation">;</span>

    <span class="token annotation punctuation">@GetMapping</span><span class="token punctuation">(</span><span class="token string">"/hello"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        asyncService<span class="token punctuation">.</span><span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token string">"success"</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>访问 <a target="_blank" rel="noopener" href="http://localhost:8080/hello">http://localhost:8080/hello</a> 进行测试，3 秒后出现 success，这是同步等待的情况。</p>
<p>❓ 需求：我们如果想让用户立即得到消息而不需要进行等待，可以在后台使用多线程的方式进行处理即可，但是每次都需要自己手动去编写多线程的话，太麻烦了，我们只需要在我们的方法上加一个简单的注解 <code>@Async</code> 即可，如下：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Service</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AsyncService</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Async</span> <span class="token comment">// 告诉 Spring 这是一个异步方法</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
            <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
            e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"业务进行中..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>SpringBoot 就会自己开一个线程池，进行调用。但是要让这个注解生效，我们还需要在主程序上添加一个注解<code>@EnableAsync</code> ，开启异步注解功能：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@SpringBootApplication</span>
<span class="token annotation punctuation">@EnableAsync</span>  <span class="token comment">// 开启异步注解功能</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">DemoApplication</span> <span class="token punctuation">&#123;</span>

    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token class-name">SpringApplication</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">DemoApplication</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>访问 <a target="_blank" rel="noopener" href="http://localhost:8080/hello">http://localhost:8080/hello</a> 进行测试，网页立即响应而不会等待 3 秒，且后台代码依旧执行。</p>
<h2 id="2-定时任务"><a href="#2-定时任务" class="headerlink" title="2. 定时任务"></a>2. 定时任务</h2><p>项目开发中经常需要执行一些定时任务，比如需要在每天凌晨的时候，分析一次前一天的日志信息，Spring为我们提供了异步执行任务调度的方式，提供了两个接口。</p>
<ul>
<li><code>TaskExecutor</code> 接口</li>
<li><code>TaskScheduler</code> 接口</li>
</ul>
<p>两个注解：</p>
<ul>
<li><code>@EnableScheduling</code></li>
<li><code>@Scheduled</code></li>
</ul>
<h3 id="①-cron-表达式"><a href="#①-cron-表达式" class="headerlink" title="① cron 表达式"></a>① cron 表达式</h3><p>Cron 表达式是一个字符串，字符串以5或6个空格隔开，分为6或7个域，每一个域代表一个含义，Cron 有如下两种语法格式：</p>
<ul>
<li><p>Seconds Minutes Hours DayofMonth Month DayofWeek Year</p>
</li>
<li><p>Seconds Minutes Hours DayofMonth Month DayofWeek</p>
</li>
</ul>
<p>👇 各字段的含义：</p>
<table>
<thead>
<tr>
<th>字段</th>
<th>允许值</th>
<th>允许的特殊字符</th>
</tr>
</thead>
<tbody><tr>
<td>秒（Seconds）</td>
<td>0~59的整数</td>
<td>, - * /   四个字符</td>
</tr>
<tr>
<td>分（<em>Minutes</em>）</td>
<td>0~59的整数</td>
<td>, - * /   四个字符</td>
</tr>
<tr>
<td>小时（<em>Hours</em>）</td>
<td>0~23的整数</td>
<td>, - * /   四个字符</td>
</tr>
<tr>
<td>日期（<em>DayofMonth</em>）</td>
<td>1~31的整数（但是你需要考虑你月的天数）</td>
<td>,- * ? / L W C   八个字符</td>
</tr>
<tr>
<td>月份（<em>Month</em>）</td>
<td>1~12的整数或者 JAN-DEC</td>
<td>, - * /   四个字符</td>
</tr>
<tr>
<td>星期（<em>DayofWeek</em>）</td>
<td>1~7的整数或者 SUN-SAT （<strong>1=SUN</strong>）</td>
<td>, - * ? / L C #   八个字符</td>
</tr>
<tr>
<td>年(可选，留空)（<em>Year</em>）</td>
<td>1970~2099</td>
<td>, - * /   四个字符</td>
</tr>
</tbody></table>
<p>每一个域都可以使用数字，也还可以出现如下特殊字符，它们的含义分别是： </p>
<ul>
<li><p><code>*</code> ：<strong>表示匹配该域的任意值</strong>，假如在Minutes域使用 <code>*</code>, 即表示每分钟都会触发事件。</p>
</li>
<li><p><code>?</code>：<strong>只能用在 DayofMonth 和 DayofWeek 两个域。它也匹配域的任意值，但实际不会。因为 DayofMonth 和 DayofWeek 会相互影响。</strong></p>
<p>例如想在每月的20日触发调度，不管20日到底是星期几，则只能使用如下写法： <code>13 13 15 20 * ?</code>, 其中最后一位只能用 <code>？</code>，而不能使用 <code>*</code>，如果使用 <code>*</code> 表示不管星期几都会触发，实际上并不是这样。 </p>
</li>
<li><p><code>-</code>：<strong>表示范围</strong>，例如在 Minutes 域使用 <code>5-20</code>，表示从5分到20分钟每分钟触发一次 </p>
</li>
<li><p><code>/</code>：<strong>表示起始时间开始触发，然后每隔固定时间触发一次</strong>，例如在Minutes域使用 <code>5/20</code>, 则意味着从第 5 分钟触发一次，然后每隔 20 分钟触发一次</p>
</li>
<li><p><code>,</code>：<strong>表示列出枚举值值</strong>。例如：在 Minutes 域使用 <code>5,20</code>，则意味着在5和20分每分钟触发一次。 </p>
</li>
<li><p><code>L</code>：<strong>表示最后，只能出现在 DayofWeek 和 DayofMonth 域</strong>，如果在 DayofWeek 域使用 <code>5L</code>,意味着在最后的一个星期四触发。</p>
</li>
<li><p><code>W</code>：<strong>表示有效工作日(周一到周五),只能出现在DayofMonth域，系统将在离指定日期的最近的有效工作日触发事件</strong>。例如：在 DayofMonth使用 <code>5W</code>，如果 5 日是星期六，则将在最近的工作日：星期五，即 4 日触发。如果 5 日是星期天，则在6日(周一)触发；如果 5 日在星期一 到星期五中的一天，则就在 5 日触发。另外一点，<code>W</code> 的最近寻找不会跨过月份。</p>
</li>
<li><p><code>LW</code>：这两个字符可以连用，表示在某个月最后一个工作日，即最后一个星期五。 </p>
</li>
<li><p><code>#</code>：用于确定每个月第几个星期几，只能出现在DayofMonth域。例如 <code>4#2</code> ，表示某月的第二个星期三。 </p>
</li>
</ul>
<p>✍ 举几个例子: </p>
<ul>
<li><p>每隔5秒执行一次：<code>*/5 * * * * ?</code></p>
</li>
<li><p>每隔1分钟执行一次：<code>0 */1 * * * ?</code></p>
</li>
<li><p>每天23点执行一次：<code>0 0 23 * * ?</code></p>
</li>
<li><p>每天凌晨1点执行一次：<code>0 0 1 * * ?</code></p>
</li>
<li><p>每月1号凌晨1点执行一次：<code>0 0 1 1 * ?</code></p>
</li>
<li><p>每月最后一天23点执行一次：<code>0 0 23 L * ?</code></p>
</li>
<li><p>每周星期天凌晨1点实行一次：<code>0 0 1 ? * L</code></p>
</li>
<li><p>在26分、29分、33分执行一次：<code>0 26,29,33 * * * ?</code></p>
</li>
<li><p>每天的0点、13点、18点、21点都执行一次：<code>0 0 0,13,18,21 * * ?</code></p>
</li>
<li><p>表示在每月的1日的凌晨2点调度任务：<code>0 0 2 1 * ? *</code></p>
</li>
<li><p>表示周一到周五每天上午10：15执行作业：<code>0 15 10 ? * MON-FRI</code></p>
</li>
<li><p>表示2002-2006年的每个月的最后一个星期五上午10:15执行：<code>0 15 10 ? 6L 2002-2006</code></p>
</li>
</ul>
<h3 id="②-示例"><a href="#②-示例" class="headerlink" title="② 示例"></a>② 示例</h3><p>创建一个 <code>ScheduledService</code>，里面存在一个定时执行的方法：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Service</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ScheduleService</span> <span class="token punctuation">&#123;</span>
    <span class="token annotation punctuation">@Scheduled</span><span class="token punctuation">(</span>cron <span class="token operator">=</span> <span class="token string">"0 * * * * MON-FRI"</span><span class="token punctuation">)</span> <span class="token comment">// 工作日执行</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"hello..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>写完定时任务之后，我们需要在主程序上增加 <code>@EnableScheduling</code> 开启定时任务功能：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@EnableScheduling</span> <span class="token comment">//开启基于注解的定时任务</span>
<span class="token annotation punctuation">@SpringBootApplication</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">SpringbootTaskApplication</span> <span class="token punctuation">&#123;</span>

   <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
       <span class="token class-name">SpringApplication</span><span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token class-name">SpringbootTaskApplication</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>

<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="3-邮件任务"><a href="#3-邮件任务" class="headerlink" title="3. 邮件任务"></a>3. 邮件任务</h2><p>邮件发送，在我们的日常开发中，也非常的多，Springboot 帮我们做了支持：</p>
<ul>
<li>邮件发送需要引入 <code>spring-boot-start-mail</code></li>
<li>SpringBoot 自动配置 <code>MailSenderAutoConfiguration</code></li>
<li>定义 <code>MailProperties</code> 内容，配置在 <code>application.yml</code> 中</li>
<li>自动装配 <code>JavaMailSender</code></li>
<li>测试邮件发送</li>
</ul>
<p>✍ <strong>示例</strong>：</p>
<p><strong>1）首先引入 pom 依赖</strong>：</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
   <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-mail<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p>点进去 <code>spring-boot-starter-mail</code>，可以看到 <code>jakarta.mail</code>：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200714115330.png"></p>
<p>查看自动配置类：<code>MailSenderAutoConfiguration</code>：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200714120502.png"></p>
<p>查看 <code>MailSenderJndiConfiguration</code>：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200714120623.png"></p>
<p>然后我们去看下 <code>MailPropertires</code>：</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200714120741.png"></p>
<p>**2）显然，需要我们在全局配置文件中配置 <code>spring.mail</code>**：</p>
<pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token attr-name">spring.mail.username</span><span class="token punctuation">=</span><span class="token attr-value">1912420914@qq.com</span>
<span class="token attr-name">spring.mail.password</span><span class="token punctuation">=</span><span class="token attr-value">你的qq授权码 </span>
<span class="token attr-name">spring.mail.host</span><span class="token punctuation">=</span><span class="token attr-value">smtp.qq.com</span>
<span class="token comment"># qq需要配置ssl</span>
<span class="token attr-name">spring.mail.properties.mail.smtp.ssl.enable</span><span class="token punctuation">=</span><span class="token attr-value">true</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>📡 <strong>获取授权码</strong>：在QQ邮箱中的 设置 -&gt; 账户 -&gt; 开启 pop3 和 smtp 服务</p>
<p><img src="https://gitee.com/veal98/images/raw/master/img/20200714121635.png"></p>
<p><strong>3）Spring 单元测试</strong>：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@SpringBootTest</span>
<span class="token keyword">class</span> <span class="token class-name">DemoApplicationTests</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Autowired</span>
    <span class="token class-name">JavaMailSenderImpl</span> mailSender<span class="token punctuation">;</span>

    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">void</span> <span class="token function">contextLoads</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">//邮件设置1：一个简单的邮件</span>
        <span class="token class-name">SimpleMailMessage</span> message <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SimpleMailMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        message<span class="token punctuation">.</span><span class="token function">setSubject</span><span class="token punctuation">(</span><span class="token string">"测试：邮件任务测试"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        message<span class="token punctuation">.</span><span class="token function">setText</span><span class="token punctuation">(</span><span class="token string">"Hello"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        message<span class="token punctuation">.</span><span class="token function">setTo</span><span class="token punctuation">(</span><span class="token string">"1912420914@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        message<span class="token punctuation">.</span><span class="token function">setFrom</span><span class="token punctuation">(</span><span class="token string">"1912420914@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        mailSender<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    
<span class="token punctuation">&#125;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>查看邮件，邮件接收成功。</p>
<img src="https://gitee.com/veal98/images/raw/master/img/20200714122223.png" style="zoom:67%;" />

<p>👍 还可以通过 MIME 协议发送带有复杂内容的邮件：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">contextLoads2</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">MessagingException</span><span class="token punctuation">&#123;</span>
    <span class="token comment">// 邮件设置2：一个复杂的邮件</span>
    <span class="token class-name">MimeMessage</span> mimeMessage <span class="token operator">=</span> mailSender<span class="token punctuation">.</span><span class="token function">createMimeMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">MimeMessageHelper</span> helper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MimeMessageHelper</span><span class="token punctuation">(</span>mimeMessage<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    helper<span class="token punctuation">.</span><span class="token function">setSubject</span><span class="token punctuation">(</span><span class="token string">"测试：邮件任务测试"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    helper<span class="token punctuation">.</span><span class="token function">setText</span><span class="token punctuation">(</span><span class="token string">"&lt;b style='color:red'>今天 7:30 来开会&lt;/b>"</span><span class="token punctuation">,</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token comment">// 发送附件</span>
    helper<span class="token punctuation">.</span><span class="token function">addAttachment</span><span class="token punctuation">(</span><span class="token string">"1.jpg"</span><span class="token punctuation">,</span><span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    helper<span class="token punctuation">.</span><span class="token function">addAttachment</span><span class="token punctuation">(</span><span class="token string">"2.jpg"</span><span class="token punctuation">,</span><span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    helper<span class="token punctuation">.</span><span class="token function">setTo</span><span class="token punctuation">(</span><span class="token string">"1912420914@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    helper<span class="token punctuation">.</span><span class="token function">setFrom</span><span class="token punctuation">(</span><span class="token string">"1912420914@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    mailSender<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>mimeMessage<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="📚-References"><a href="#📚-References" class="headerlink" title="📚 References"></a>📚 References</h2><ul>
<li><p><a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV1PE411i7CV?p=26">【狂神说Java】SpringBoot 最新教程IDEA版通俗易懂</a></p>
</li>
<li><p><a target="_blank" rel="noopener" href="https://www.cnblogs.com/xiang--liu/p/11378860.html">@Scheduled cron表达式</a></p>
</li>
</ul>

                
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